Cutting press



June 8, 1937. J, A -r 2,083,097 CUTTING PRESS Filed Jan. 22, 193 2 Sheets-Sheet 1 Jaye/2501'.-

June 8,1937. J, SAND'T 2,083,097

\ CUTTING PRESS I Filed Jan. 22, 1934 2 Sheets-She'e t 2 J/zue/z for:

Patented June 8, i937 unirso srarss PATE oFFieE CUTTING PRESS Julius Sandt, Pirmasens, Germany Application January 22, 1934, Serial No. 707,837 In Germany June 3, 1932 1 I 11 Claims. (01.164523) The present invention relates to presses employed in cutting sheet material, by freely movable dies, between a cutting block and a vertically and horizontally movable beam. While the beam is in its upper and lateral position the operator places the die upon the material lying on the block to be cut and swings the beam over the die. Then he depresses a treadle to clutch in the motor drive which imparts to the beam a downward or clicking movement and a return movement. Thereupon the operator swings the beam aside to remove the out out part of material and to place the die on another part of the material to repeat the work. The continued lateral swinging of the heavy beam back and forth is quite troublesome for the operator, inasmuch as the beam used to be of cast iron. It has therefore been proposed to make the beam of light metal such as an aluminium alloy. But the alloys of this kind are brittle and liable to a rapid wear.-

In some cases the beams have been made up partly of a light metal and partly of cast iron. But by these means the weight of the beam is not materially reduced, moreover the beam thus obtained consists of several parts and is therefore not reliable.

Now according to my invention the beam is built up in a box-like form of preferably welded steel sheets. The new beam has the third of the weight of a cast iron beam of the same tensile strength and is not liable to an appreciable wear. The lower steel plate of the beam acting upon the die is preferably chosen of a Martin steel of a high modul of elasticity, say of a tensile strength of 80 kg. Such a plate does not become bumpered by the blows upon the die as it owing to its elasticity always returns to its normal form. For the upper and the side walls of the beam a steel of about 60 kg. strength may be used as this steel gives a more homogeneous welding.

Owing to a further development of the invention a further reduction of the weight of the beam can be obtained by avoiding the common rings for clamping the beam to the vertical carrying post and by direct welding of the beam to this post.

The invention is shown in the accompanying drawings. a

l is a side view with the beam in a vertical central section along the line 1-1 of Fig. 2.

Fig. 2 is a plane view of the beam.

Fig. 3 shows a modification in view corresponding to Fig. 1.

Fig. 4 is a partial cross section of the beam.

The general construction of the press is well known and is 'for instance shown in the U. S. Patent No.'921,503 of May 11, 1909. The beam I is fastened to the rotatable and vertically movable post 2. Every time the handle 3 is lowered the press is clutched in for one revolution. The beam imparts a blow to the die placed on the material spread over the block 4 so that the die is forced through the material. The beam does not of course hit the die with its median line. Moreover more or less its right or left side comes into contact with the die so that the beam is exposed in a high degree to torsion.

The handle serves also to lateral swinging of the beam, so as to allow of an easy placing of the die upon the desired spot of the material to be cut. According to the invention the walls are built up of steel sheets in a box-like form. They are preferably connected by welding. The lower wall I is exposed to bending stresses and to be worn out by the die. It is therefore advisable to use for it a steel of higher strength than for the walls I.

The clamping rings 5 for fastening of the beam to the post 2 hitherto of cast iron are now substituted by steel-rings adapted to be welded to the beam. Into bores of the steel rings are introduced bushes which are pressed for clamping against the post 2 by the screws 1.

In the modification shown in Figs. 3 and 4 the clamping rings are dispensed with and the beam is directly welded to the post 2 at I2. The post is guided in a journal IE3 of the machine frame 8. With greater presses a second journal II is provided which supports the post above the beam. In this case the frame is made of two parts and the part 9 is fastened in place after the insertion of the post 2 into the journal ll What I claim is:

1. In a cutting press having a vertically movable post, a bed, and a beam mounted on said post that can be swung by the operator into different operative positions overv the bed, rolled steel plates forming part of said beam, one of said plates forming the bottom of saidbeam and madeof a material of greater tensile strength than the others or" said plates;

2. In a cutting press having a vertically movable beam that can be swung by the operator into dilierent operative positions over the bed, a plurality of steel plates assembled in box-formation and forming said beam, and a vertical post supporting and integrally connected to said plates.

3. In a cutting press, a bed, a reciprocatable and revolvable post, and plates welded upon said post, extending therefrom as a pressing beam, and movable over said bed of the press.

4. In a cutting press, a bed, a post reciprocatably and revolvably mounted in said press, and plates forming a beam, some of said plates being substantially tangentially welded onto said post, said beam being movable over said bed of the press.

5. In a cutting press, a bed, a post reciprocatably and revolvably mounted in said press, and plates welded to said post, angularly extending from said post and forming a beam which is movable over said bed of the press.

6. In a cutting press, a bed, a post reciprocat-.

ably and revolvably mounted in said press, and plates welded together and to said post, angularly extending from said post and forming a beam which is movable over said bed of the press.

'7. In a cutting press, a bed, a post reciprocatably and revolvably mounted in said pressfand plates welded in box formation together and to said post, angularly extending from said post and forming a beam which is movable oversaid bed of the press.

8. In a cutting press, a multicornered beam swingable into and out of an operative position, and movable in the operative position, steel plates making up said beam and Welded together at the corners of said beam.

9. In a cutting press, a multicornered beam swingable into and out of an operative position, and movable in the operative position, steel plates making up said beam and welded together in closed box formation.

10. A cutting press comprising a bed, a post vertically movably mounted in said press, and a beam mounted on said post and swingable into different operative position over said bed, said beam being composed of a plurality of steel plates assembled in box formation.

11. A cutting press comprising a bed, a post vertically movably mounted in said press, and a beam mounted on said post and swingable into diiierent operative position over said bed, said beam being composed of a plurality of steel plates assembled in box formation, the operative lower one of said plates being of higher tensile strength than the other plates.

JULIUS SANDT. 

